import * as fs from 'node:fs';
import * as os from 'node:os';
import * as path from 'node:path';

/**
 * WP-74: `playwright.config.ts` gives the backend a UNIQUE throwaway SQLite file
 * per `npm run e2e` invocation (`<tmpdir>/big-register-e2e-<pid>-<timestamp>.db`),
 * so Playwright has no webServer teardown hook to delete it once a run ends — this
 * sweeps them up instead, at the START of the NEXT run.
 *
 * Safe regardless of run ordering: `globalSetup` always executes AFTER `webServer`
 * has already started (Playwright's task order, not something a config can flip),
 * so THIS run's own file (`process.env['E2E_DB_PATH']`, set by the config module —
 * same node process, so the assignment is visible here) is always excluded. Every
 * OTHER matching file belongs to an invocation whose `dotnet run` process has
 * already exited, so deleting it can't race a live connection.
 */
export default function globalSetup(): void {
  const mine = process.env['E2E_DB_PATH'];
  const dir = os.tmpdir();
  let entries: string[];
  try {
    entries = fs.readdirSync(dir);
  } catch {
    return; // best-effort cleanup — a missing/unreadable temp dir isn't this run's problem
  }

  for (const name of entries) {
    if (!name.startsWith('big-register-e2e-')) continue;
    const base = name.replace(/(-shm|-wal)$/, '');
    if (mine && base === path.basename(mine)) continue; // never this run's own file
    try {
      fs.unlinkSync(path.join(dir, name));
    } catch {
      // best-effort — a file another leftover process still has open, or already
      // gone, is not worth failing this run's e2e suite over.
    }
  }
}